While new HEC prices are a bit ridiculous there is enough high quality used
doorknobs around plus the Russian surplus RF caps are also excellent.
I passed over those Chinese caps as a bad deal years ago once I found the
actual specs.
Carl
KM1H
----- Original Message -----
From: "Rob Atkinson" <ranchorobbo@gmail.com>
To: <amps@contesting.com>
Sent: Saturday, March 24, 2012 9:17 AM
Subject: Re: [Amps] Chinese Caps Defective @ RF
> You have a lot of circulating current through blocking caps on 10 m.
> For a critical application, I'd stick with a known manufacturer like
> HEC where you can see a range of specifications and test data. You do
> pay more, but you only have to pay one time. "off-brand" caps can be
> used in homebrew antenna tuners where it is okay to um, experiment.
>
> The dielectric temp. constant is one thing to consider and indeed, the
> caps should be class 1. The other factor is the external temperature
> environment. For example, are the caps mounted near a tube that
> throws off a lot of heat. A good manufacturer will supply an
> environmental temperature range spec. that the cap has to stay within
> to keep its value.
>
> 73
>
> Rob
> K5UJ
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